MONOGRAPH OF THE EXISTING CRINOIDS. 727 



Rathbun said that the color varies greatly; nearly half the specimens have a tinge 

 of green, varying to bluish, this color being sometimes very light, at others dark; 

 many specimens were very light purplish, purplish white or yellowish white ; light 

 shades of brown and gray also occurred, and several varieties of coloring may be 

 found on the same specimen ; the arm bases and calyx are generally darker than 

 the rest of the body, being often of a dark olive color. He remarked that Endoxo- 

 crinus parrot retains more of its natural color in alcohol than Isocrinus decorus. 

 Professor Nutting found none that were either white or yellow, all being of some 

 shade of light brown, usually wllth a purplish or violet tinge, and sometimes ap- 

 proaching a flesh color. 



Family PHRYNOCRINIDJE. 

 Phrynocrinus nudus. Dull greenish yellow. 



Family BOURGUETICRINID^E. 



Bathycrinus pacificus. Very light yellow. 



Ilycrinus carpenteri. Beautiful straw yellow throughout, the root being a 

 little darker than the rest of the column. The crown is, perhaps, a little paler ; but 

 when the sexual organs contain the sexual products the pinnules are much darker. 



Rhizocrinus lofotensis. (a) Clear grayish brown. 



(6) Clear grayish yellow. 



(c) Whitish gray. 



Democrinus rawsonii. (a) Whitish. 



(b) Column grayish yellow; arm tips and pinnules lemon yellow. 



A brownish species of Rhizocrinus or Bythncri/nufi has been mentioned by 

 Professor Nutting, and Mr. Alexander Agassiz snys that ^Rhizocrinus lofotemis n 

 (probably a species of Bythocrinus) when alive is brownish chestnut, varying from 

 that to a dirty white. 



Family APIOCRINIDJE. 



Proisocrinus ruberrimus. Brilliant uniform scarlet. 



Family PLICATOCRINID^E. 



Calamocrinus diomedo'. Brilliant lemon yellow, with a greenish tinge on the 

 sides of the arms and along the ambiilacral grooves. 



Ptilocrinus pinnatus. Bright yellow. 



Ptilocrinus antarcticus. Bright yellow. 



Gephyrocrinus grimaldii. Yellow. 



Thalassocrinus pontifer. Pale sulphur yellow, the lower end of the column 

 becoming brownish. 



SUMMARY. 



Among the comatulids we have 213 records of the living colors, of which the 

 present author is responsible, directly and indirectly, for 109. These records refer 

 to 130 species, and of these the author has handled living specimens of 49. 

 142140 21 Bull. 82 48 



